I've often said that the splinter groups have served a valuable purpose as "airlocks." Just as a person returning from deep underwater needs to spend some time in differing pressure environments before reaching the surface (their body needs to adjust to different pressure environments), people leaving twi need time to spend in differing pressure environments before fully escaping (their mind needs to adjust to different pressure environments.)
So, part of it is being enough like the imagined "good old days" of twi, while a person looks around and sees that the rest of the world and the rest of Christianity really is no worse than twi and is usually better. Once that's sunk in, then the splinter needs to turn up the heat and do something stupid so the person gets sick and tired of being sick and tired, and jumps ship completely from twi and ex-twi. Then they can go do something else- alone, with other Christians, with non-Christians. etc.
So, as we see, the pinhead who tried to bully Twinky while having a meltdown served a vital function- he drove off "his congregation" and they went out into the world just as Twinky did, and for much the same reasons. He didn't MEAN it that way, but it worked out that way. (He meant it to her for evil...)